KENDRIYA VIDYALAYA KAMPTEE

Chemistry Investigatory Project

Session 2012-13

Study of the given sample of Antacid

Made by:- Gopal Mishra

of class 12th ‘B’

Roll no.:-29

Acknowledgements

I would like to express my special thanks of gratitude to my chemistry teacher Mr. Nandeshwar

as well as our principal Mr. S.S. Upadhyay who gave me the golden opportunity to do this

wonderful project on the topic Study of given sample of Antacids, which also helped me in doing

a lot of Research and I came to know about so many new things. I am really thankful to them.

Secondly I would also like to thank my parents and friends who helped me a lot in finishing this project

within the limited time.

Thirdly I also want to thank my chemistry lab assistant Mr. Sajan for helping me to make this

project successful.

Thanks Again To All Who Helped Me In Making Of This Project.

-Gopal Mishra

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Contents

Acknowledgements …………………………………2Certificate……………………………………………4Aim ………………………………………...............5Introduction…………………………………………6Apparatus Required…………………………………8Procedure ……………………………………..........9Observation ………………………………………...11Conclusion……………………………………..…..14Remarks…………………………………………….15

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Certificate 

This is to certify that Gopal Mishra has satisfactorily

completed the course of Chemistry Investigatory

Project prescribed by the CBSE under the AISSCE course in the

laboratory of K.V. Kamptee school in the year of 2012-13.

Signatures

CHEMISTRY TEACHER PRINCIPAL

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AIM:-

To analyze the given samples of commercial antacids by determining the amount of hydrochloric acid they can neutralize.

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INTRODUCTION:-

Antacids:-

An Antacid is any substance, generally a base or basic salt, which neutralizes stomach acidity. They are used to relieve acid indigestion, upset stomach, sour stomach, and heartburn.

Action mechanism:-

Antacids perform a neutralization reaction, i.e. they buffer gastric acid, raising the pH to reduce acidity in the stomach. When gastric hydrochloric acid reaches the nerves in the gastrointestinal mucosa, they signal pain to the central nervous system. This happens when these nerves are exposed, as in peptic ulcers. The gastric acid may also reach ulcers in the esophagus or the duodenum. Other mechanisms may contribute, such as the effect of aluminium ions inhibiting smooth muscle cell contraction and delaying gastric emptying.

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Indications:-

Antacids are taken by mouth to relieve heartburn, the major symptom of gastro esophageal reflux disease, or acid indigestion. Treatment with antacids alone is symptomatic and only justified for minor symptoms. Peptic ulcers may require H2-receptor antagonists or proton pump inhibitors. The utility of many combinations of antacids is not clear, although the combination of magnesium and aluminium salts may prevent alteration of bowel habits.

Some famous antacid brands:-

1. Milk of Magnesia – Mg(OH)2

2. Equate – Al(OH)3 and Mg(OH)2

3. Gaviscon – Al(OH)3

4. Maalox (liquid) – Al(OH)3 and Mg(OH)2

5.Maalox (tablet) – CaCO3

6. Digene – Al(OH)3 and Mg(OH)2

7. Gelusil – Al(OH)3

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APPARATUS REQUIRED:-

Burettes, pipettes, titration flasks, measuring flasks, beakers, weight box, fractional weights, sodium hydroxide, sodium carbonate, hydrochloric acid, phenolphthalein.

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PROCEDURE :-

1. Prepare 1 litre of approximately  HCl solution by diluting 10 ml of the concentrated acid for one litre.

2. Similarly, make 1 litre of approximately NaOH solution by dissolving4.0g of NaOH to prepare one litre of solution.

3. Prepare  Na2CO3 solution by weighing exactly 1.325 g of anhydrous sodium carbonate and then dissolving it in water to prepare exactly 0.25 litres (250 ml) of solution.

4. Standardize the HCl solution by titrating it against the standard Na2CO3 solution using methyl orange as indicator.

5. Similarly, standardize NaOH solution by titrating it against standardized HCl solution using phenolphthalein as indicator.

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6. Powder the various samples of antacid tablets and weigh 1.0 g of each.

7. Add a specific volume of standardised HCl to each of the weighed sample is taken in conical flasks. The acid should be in slight excess, so that it can neutralize all the alkaline component of the tablet.

8. Add 2 drops of phenolphthalein and warm the flask till most of powder dissolves. Filter off the insoluble material.

9. Titrate this solution against the standardized NaOH solution, till a permanent pinkish tinge is obtained. Repeat this experiment with different antacids. 

OBSERVATIONS AND CALCULATIONS :-

Standardization of HCl solution :-

Volume of Na2CO3 solution taken = 20.0 ml

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S. No.Burette readings

(ml)Volume of acid used

(ml)Initial Final

Concordant reading = …… ml

Applying molarity equation, N1V1 = N2V2

N1 * …… =  ……* 20

Normality of HCl, N1 = 2/…… N

Standardization of NaOH solution :-

Volume of the given NaOH solution taken = 20.0 ml

S. No.Burette readings

(ml)Volume of acid used

(ml)Initial Final

Concordant volume = …… ml

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Applying normality equation,

N1’V1’ (ACID)= N2’V2’ (BASE)

= (2/……)(……)

Normality of NaOH, N2’ ……/10*…… N

Analysis of antacid tablet :

Weight of antacid tablet powder = 1.0 g

Volume of HCl solution added = …… ml

S.No. Antacid

Volume of NaoH solution

used for neutralizing unused HCl

(ml)

Volume of HCl solution used

for neutralizing 1.0 g of an

antacid matter(ml)

1. Gelusil

2. Digene

3. Visco

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CONCLUSION :-

The antacid which has maximum volume of HCl is used for neutralizing i.e. ………………………………….is more effective.

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Thanks For Viewing

Your Remarks Please…

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